Had a rash that started on the scrotum, spreading to thighs and elbow. Is it jock itch?

Hi, I had a rash that started on the scrotum area, then actually impacted the penis skin (which made it very painful) A milder rash is also starting on the back of my thigh and on the side of my elbow . At first I thought that this may be jock itch , but they say that it usually does not impact the penis itself. What do you think? Thank you for your time...